Remove old coordinates input

Author: birgits

example/turbine_cluster_modelchain_example.ipynb

@@ -160,8 +160,7 @@
     "# specification of cluster data\n",
     "example_cluster_data = {\n",
     "    'name': 'example_cluster',\n",
-    "    'wind_farms': [example_farm, example_farm_2],\n",
-    "    'coordinates': [52.2, 13.1]}\n",
+    "    'wind_farms': [example_farm, example_farm_2]}\n",
     "\n",
     "# initialize WindTurbineCluster object\n",
     "example_cluster = WindTurbineCluster(**example_cluster_data)\n"